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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d0647366e45bdb50dcb6c11e9f2a3ffdabd1b4eb827b7196d99803f639e4c3' 
  AND token = '1dHPzx8f1H9dt8l8R/XDM/YYy040nbkJePRwScruGQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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