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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9aa24c3cf3280828775ee67c0417cbc3e60911571c3021b6eda1d5afdd83a2a' 
  AND token = 'f17MnKfhMQGqWaM390hq6qQSVHtgVldK8tAigw2PR+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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