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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb18d40f96e6b31bf654658b73bef1d7b2d9208b7d1dfc6f5891f313598136d3' 
  AND token = 'bNQN2H2w5jJzLhtPfz3nRKk0kEnoOiRFEdo9h6tDy0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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