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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4181913e384fed96343108fd085028ecc2fe479d4c640a0696fc22865eb228' 
  AND token = 'QVmpwn9dIgjxc7iti2VcfQBtIGeMrRRZQxG3LiiiY4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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