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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70810a176221525b3d47927432ac963c3ee1ab40f30a856ba4a6b0639bb6d8d8' 
  AND token = 'XEq/8yEBeg7xy4FT6fPCo0+aXEgr0yY3nx7J6kopd1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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