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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08df8ec3ca20ea7ef72c4d6f25f6e3b9971a63543927182d6724c3b420097209' 
  AND token = 'y1Qput5KZgCdDamw9vr5V13//P1I8gO2lvMdRMkBzOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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