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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fcd86eed135fb6747331d82a80ea67bda3358056e99f45e5db9d165e6ec939' 
  AND token = '6g5LAJCDKPK6SPvwOWo1Q/b0AMmkFrZnFGvMgHax0yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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