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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd90c736ae4f7eec4c2d28e125557196193b62d38df849dfdf221b5ed2b75a3' 
  AND token = 'al8J/NUoevBI6cO95HK3G+Kp4S1J9Y51t4Rkif/2gDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}