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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53eb0471994db94eb8be2599691dbf86ef912a2f0d994c4a1d47b078f5e5c25f' 
  AND token = 'y2J/DxhCUby0CggjAmBIeS0TSm+01C1lexxa233RDpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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