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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f942a3a192894d850d19f4d452ae8c3e2957d586e1391f0144c75cc63c6ba209' 
  AND token = 'iDZ29EXGaEO6SnlzMdX5m9VBkc6Fz58pt9DxLQIsj1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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