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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd494b5e7eda6da0d3a957ffd1120f37ba0ea50b63ce194bc2b9d4c229019f50' 
  AND token = 'wk31JdRHBkFFFIWAv4zoEbxHOV8C+VB1yqqT+JMNA5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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