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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d9aa1bad0e278af9da1ac1c735a0ad47257a8eef5c2409e1d743c494da4b63' 
  AND token = 'xGPlgipbfWVckks+Q8hNz+KVxSUrS5q6X2uvfopm+XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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