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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7c47d4b3f6b10b61ee3a7624c8dbca0bade63f2d8a565ecb8bc2c148fcdac5' 
  AND token = 'm4V89UxbBeAP+af15wrEPVTmozkRkrm6IUKu+Q5FePs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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