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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f078ce02559d5dc0184ef179dde3bda39c0f0c9e949d30d69c670035826a402' 
  AND token = 'iYqae/+RJiFhH015B/R6Y9dtbswP7jd1ex0mOTlZgNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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