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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e982633231371f82f03f5d7fd856c1ce542b9bb27810687439fdadcc5f966bda' 
  AND token = 'NsBHPKDa9Q0Hbba4068RSCS6vu1iUp7dGg5yV7g8oxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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