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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f9e4a24a7e3c43c2f1db473529fcc4b8e320b57ec82fc1a7ba341bc2a185d9' 
  AND token = 'WNb5VwD3dg70aMCMnxfBJnwJIxMbFONSj/FdUluXZMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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