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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57cd5abf2a5430f410650f5257765ca3b5807f21489c5eac256dd539b5345d24' 
  AND token = '4CwNz0gP97WDx0b5EbjoexGWhpJaJcSPdoRiZQ+8P6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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