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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86be22ba1df6329892696f71175ce1011d2e0ab3ae77162f2536d097c8a7f468' 
  AND token = 'M46/tNga2hjXzuJtXMZUCO18CV2Fs8fr4xE7sa/ULLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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