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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be047b4c3968bcd5207565f19f5c1b6292ae07fa3c370385a0d5b360d8c342ad' 
  AND token = 'IYGEZfPWRrImRbndzxOL6Q+W+bcZ/QeaSbCeu9j0bSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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