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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d8481c8ebfcc30f286a9af9e5d9b9466f0d25617a3001d32950308ad5f027d' 
  AND token = 'aGt7v55cdl8Dq+39wCUG8oFAGrTjo2e027c/FjhywYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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