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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d3217b2c7374e4bf6d88cae90753f7d68d68bd41b683770df6a5a40bcfdbf6' 
  AND token = 'GX/ugb6w/gEFOmYtOHiEAy4vtZcBzbFVeuwY6EarWXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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