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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eeb29efd7cdb1204c4fd71e596f826c9c1ac44cc217326eef11ae12632888a2' 
  AND token = 'CKXA2sVoEU4qNZN83dieTC62hAYZe3w3uf0HhxgXKUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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