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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c3b0f3396f844a0b4e59a27b13d17855edd22e94a18683cd69917e241b5e42' 
  AND token = 'juvpq+NREiqNiJGvpAHyriPX0gGSTKrdCySs8zW4ydM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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