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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a09c30b2a3c60e823033c531f536b2f18f5c3ffd8d713f3f9e2efa2f9389cb' 
  AND token = 'y2A8SbcDaJ4HmhNTaBhn3JzGiynT34Sr7RGmrIss4rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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