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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30a5a22ccaa1c87c2b3f6d02c5f6b44f144ff38a3241da98ce0925baebdf8c2' 
  AND token = 'UdIF/+9olBWp9gGaGPrQLYc2IOYsq34qESnzkz3an2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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