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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b88ab02e769dd9edaa4c6579560131f1bf737def051afc1ae28ed0f5517332b' 
  AND token = 'Wq2qzVqZd/3OZZZ5dbnatjzr2T5eKp+MUtqT+DP39hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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