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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5da0ba44e6e949ad80090cce1eeef23f6d34b860186eb062b297411600ef6e' 
  AND token = '/Q6qm9RzqdjqNbttYGfqSGb6TB/BATH5vzxopjfBCvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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