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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06105bff7f2c0aa4b3b00b25562cabf02c94a600abd8f60daec70416aa718737' 
  AND token = 'yPeK5xr6sS/ByruwH/8v21h/OimI5zhaXXSfCuSeOYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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