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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c090529f6c2e332d6c450835cc0c65219ffc11a766894957f8ec4a0a31859dc' 
  AND token = 'O+tbprNhbI+R+iEnlPNLikk55LghWl87t/2O363uQYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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