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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e219357008b09945528dda7914398462ad51620cb109998cffd88082fb9f159f' 
  AND token = 'ZBKn3gZ2tXtq0n1yPWM1uTnZ90oy6o0MP8kp6lQ9E4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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