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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3c7c847d06865605beb0f796043caa27f7e55ac5b9467803bb6ff28d3320db' 
  AND token = 'aYR2NWD0gd0lcM9zUV+sQMT05Qq++FWCWAhizrd7tTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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