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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53501b233cd70f80fe466614cb449c146bff6d205b0dffe28ba195c253ebc1be' 
  AND token = '7iDajI93eV4lP9gYh0A4O6dUAtf45uiifnLEYElKZFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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