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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3558b342d333436d9dc86d3c80906b10eee3e2dd7d98998bbc13d10d9b33a2' 
  AND token = 'ejcapHg6M6/p+J+0Fdf6GXgcgbWPOE6EYqB9boGjHNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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