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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdedcfed60eee0e7725629ca85600eacd3b46617f3901da6e95e7b67fcd75a86' 
  AND token = 'zl9P9jjNyHVYoFyfEdDrh/G2d95EVcIVEC6pl4OOOks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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