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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af402c6b1bdd5ee373cd8dd23de5458f333a18f522253300f7a33e610c3fb280' 
  AND token = '/eJrU1zYE78750rqGqhMPUiKy4bOqpmXdKoljd03Bdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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