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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f9315c6427bd09829600618e4ac0d293ad1c4dfffca1752e83dd309ff26360' 
  AND token = 'B98f/NccuNnH7wY3eHYbi0LagnCNypghhBsLbyTqrYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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