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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923a6e43effa59220877a91d3a8ce4ebf2b83dfdd60d762dff20de601c0dde58' 
  AND token = 'OYWokrtRLFdLEQs7gBOx01xeIl5R7C+xq2PkxeQphEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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