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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740f55a469ecbb3cb40b84948b97531b97046b7ca7184ca579e345cdbacc5b78' 
  AND token = 'MJUJhVEyj27rGrYVjMNKX1dmy5S5Xx2KuH6KE1jGsSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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