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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c10c652109b35c756d65f69cc52ae0b73ebac4da2fcaea9099a50949ddbab97' 
  AND token = 'ihM1n9S+2ESnwKQUqNeF5He3i9GnYbAGp6AT+Y75Qio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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