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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94030180bb440ad8839e5a1c5cddb6962c4f4f6cd531fbe0cf90853968f69162' 
  AND token = 'Y/5EQGLrfHGWIHefFATlZsAPP6PgyBWQ3pi/C549eJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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