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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7211952f449b685134be1acfeef80a9a470f8489dffc3b37f0fe8a41d151fa02' 
  AND token = 'urt56M8/ZbL0OeeNi0H6fRiWPEW9j0mwEkqcG0y6pMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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