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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946a5158790af8dcd28101c0dbde5846524004160c930d869ad7e339dba3dc24' 
  AND token = 'N7XVj25VEhsfoWV7WBD9eeV0xMRgNqq4DcrIqjcIErI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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