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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29b894023809f10e3832cd781398bef7a7b2f8f09983f209344c2cd8bdc5db1' 
  AND token = 'ly/MmY2U2meiikRthPJSEEXsVN6DznWSFayO4NpQd4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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