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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88247326fc647ceab7787349312d37f1a07ee46904453738bdc20c7d5526ca9c' 
  AND token = 'm2Y/aq3qw8fiZ6IJC8tE9La/LzxlbZhNLMj2Xc3K5ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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