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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817c4b4b2c14e50787f8f5486d90749509381062c5a81832ca7e6edaec1b9c82' 
  AND token = 'g/ZxoHbpzJdpbDPpHZc4bNPVbBqEVDeHaoFFr0tlm84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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