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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb9456aee87e6993c7a59e66cdb0bf3db901283228b211f49f0508a7ccd5e22' 
  AND token = 'ASL5+scOb+fsbfxCvzA/bCqBu7lBHByKdCIKzEla/60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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