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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84adf7c7684b4b918d9537483898b40a78c5520c908b1be85bad565ccbf813ea' 
  AND token = 'jdoLIsrWsheUOtMa9E774VEkRQIHq7Q3tTR1BT6wFBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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