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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f707d3b7f38d659256b4d275e59939af8ca691f0ba2eef0a1bbbe1598e3b0867' 
  AND token = 'H8aN3eelvudD4ZCmfeIi1//FSvEGTL+q2sAKRGY2aOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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