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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6807ec93bca23b25e77a7f4d4bab5be213286e4d694513736c7655388db0aa' 
  AND token = 'CaSaK2cRasczWlGujKeBOuNAqLUNR28GO9wIGTsFA7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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