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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f10c6325084edf5d2e27c7d549a9be6ab62107e6bb16ae9d440de9ce620d98' 
  AND token = '1FaGZPz1rPI5B/P0Ct+HlXySnmBDzkwjbmNVAjiXE50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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