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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f16839080c940126fc9df1ae756e80113d07e959f27799f5eb5b7eba1eeae1' 
  AND token = '/AOnKFmBmFOh7UENayYk6qmGehAkftXnbyWEowFKsKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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