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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f88e6147b0d59c6937e7be7d57193e89b300b2ae6775eac03e5da3a64e258c7' 
  AND token = 'NiQkYf0El7PE2vQxE35Hpyj9VGv6J3Y/XmJInRJr6fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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