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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6dc14c58fb4a1ed8b994980e316ab6ad8bef44a82d3f2c1367d659d7093af9a' 
  AND token = '+l9QcOEhQ1FBtEjPtnJ+sd20fWo9zw6AGITvkQHW/fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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