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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0697b22b498bc7d61522d3d21281c88ce89a21e7cf51ebba328a23e02295c1' 
  AND token = 'MTc6HvRF2QW2mn2J7CP2LWciAk60iTcR00rtYD1tWZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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