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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3012f31349f887ba2484e9efc03f2d2a64d3d835c822a3d7784a292eb3199184' 
  AND token = 'g8EA6IZHHpDhNgPJ87TsK09+If4VoV/hDG1N/0BKCAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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