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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2c44855c9fa90cebd717d9cbe1d91eda44fe6309ddea7a37a0899a764f120b' 
  AND token = '4gzVqmtSV6qUt+Hr+uKlRKpo3wy0bmNywmQDuByhB3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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