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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebba7a75ab7e16a75188336f3c3e0b854f225b7078e6ed0a5fa499f69173180' 
  AND token = 'qsi+Mig8jfK0ijfObsCzlunF2q7s0G2JOlZlbXc/tko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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