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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913e10c19e27e69923af9baa1c4df70eef4cfd4e2470d753d57d357ccabf4cdb' 
  AND token = 'Kw9vBWdFpBfNOOsHXQW4Yr22K/CMoWUCQCJsdzS+o4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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