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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a733bd7a16c9ed9848138f3e1199b76b0c727ac04fdf2c835921f3430b4a1855' 
  AND token = 'YR3NuCrdWRUf8AA2vOouLyy9oTGFmvv/jp/3lX0uMdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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