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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886dcdf1673997fe238330e8c8cd93061988d8e7921a37bfe9e09fc36c8e6fe6' 
  AND token = 'jjQWwk42t0NmNgcH/AnEk94pn2StGizP1xmaL8ZX2Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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